subplot_titles Ordering Inconsistent with Documentation

[oscarrutt]

The subplot_titles argument in make_subplots appears to assign titles in column-major order (down columns) rather than the documented row-major ("reading") order.

Here is a Minimal Reproducible Example.

using PlotlyJS

# Create a 2x2 subplot with numbered titles
p = make_subplots(
    rows=2, 
    cols=2,
    subplot_titles=["1" "2" 
                    "3" "4"]
)

# Add traces to visualize the order
for i in 1:2, j in 1:2
    add_trace!(p, PlotlyJS.scatter(x=[1], y=[1]), row=i, col=j)
end

display(p)

Current Behavior:
The titles are assigned in this order:
1 3
2 4

Expected Behavior:
According to the documentation, the titles should be assigned in reading order (left-to-right, then top-to-bottom):
1 2
3 4

Version info
Julia Version 1.10.0 Commit 3120989f39b (2023-12-25 18:01 UTC) Build Info: Official https://julialang.org/ release Platform Info: OS: macOS (arm64-apple-darwin22.4.0) CPU: 10 × Apple M1 Pro WORD_SIZE: 64 LIBM: libopenlibm LLVM: libLLVM-15.0.7 (ORCJIT, apple-m1) Threads: 1 on 8 virtual cores
Please provide the following:

Output of pkg"status"
Status ~/.julia/environments/v1.10/Project.toml⌃ [ad839575] Blink v0.12.5 ⌃ [336ed68f] CSV v0.10.14 ⌃ [a6e380b2] ControlSystems v1.10.0 [717857b8] DSP v0.7.10 [a93c6f00] DataFrames v1.7.0 [7a1cc6ca] FFTW v1.8.0 ⌃ [5789e2e9] FileIO v1.16.3 ⌅ [cd3eb016] HTTP v0.9.17 [caafb194] Kaleido v0.2.7 ⌃ [b964fa9f] LaTeXStrings v1.3.1 [58dd65bb] Plotly v0.4.1 [a03496cd] PlotlyBase v0.8.19 ⌃ [f0f68f2c] PlotlyJS v0.18.14 [f2990250] PlotlyKaleido v2.2.5 ⌃ [91a5bcdd] Plots v1.40.8 ⌃ [c3e4b0f8] Pluto v0.17.7 [80ea8bcb] PortAudio v1.3.0 ⌃ [df1fea92] SignalAnalysis v0.9.0 ⌃ [90137ffa] StaticArrays v1.9.7 [40c74d1a] TableView v0.8.0 [8149f6b0] WAV v1.2.0 [f7e6163d] Kaleido_jll v0.2.1+0